ucert.c

   1 /*
   2  * Copyright (C) 2018 Daniel Golle <daniel@makrotopia.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 3
   6  * as published by the Free Software Foundation
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #define _GNU_SOURCE
  15
  16 #include <fcntl.h>
  17 #include <dlfcn.h>
  18 #include <stdio.h>
  19 #include <stdbool.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <getopt.h>
  23 #include <stdint.h>
  24 #include <unistd.h>
  25 #include <inttypes.h>
  26 #include <sys/stat.h>
  27 #include <sys/wait.h>
  28
  29 #include <json-c/json.h>
  30 #include <libubox/blob.h>
  31 #include <libubox/utils.h>
  32 #include <libubox/list.h>
  33 #include <libubox/vlist.h>
  34 #include <libubox/blobmsg_json.h>
  35
  36 #include "usign.h"
  37
  38 #define CERT_BUF_LEN 4096
  39
  40 static enum {
  41         CMD_APPEND,
  42         CMD_DUMP,
  43         CMD_ISSUE,
  44         CMD_REVOKE,
  45         CMD_VERIFY,
  46         CMD_NONE,
  47 } cmd = CMD_NONE;
  48
  49 static bool quiet;
  50
  51 enum cert_attr {
  52         CERT_ATTR_SIGNATURE,
  53         CERT_ATTR_PAYLOAD,
  54         CERT_ATTR_MAX
  55 };
  56
  57 static const struct blob_attr_info cert_policy[CERT_ATTR_MAX] = {
  58         [CERT_ATTR_SIGNATURE] = { .type = BLOB_ATTR_BINARY },
  59         [CERT_ATTR_PAYLOAD] = { .type = BLOB_ATTR_NESTED },
  60 };
  61
  62 enum cert_payload_attr {
  63         CERT_PL_ATTR_CERTTYPE,
  64         CERT_PL_ATTR_CERTID,
  65         CERT_PL_ATTR_VALIDFROMTIME,
  66         CERT_PL_ATTR_EXPIRETIME,
  67         CERT_PL_ATTR_PUBKEY,
  68         CERT_PL_ATTR_KEY_FINGERPRINT,
  69         CERT_PL_ATTR_MAX
  70 };
  71
  72 enum certtype_id {
  73         CERTTYPE_UNSPEC,
  74         CERTTYPE_AUTH,
  75         CERTTYPE_REVOKE
  76 };
  77
  78 static const struct blobmsg_policy cert_payload_policy[CERT_PL_ATTR_MAX] = {
  79         [CERT_PL_ATTR_CERTTYPE] = { .type = BLOBMSG_TYPE_INT8 },
  80         [CERT_PL_ATTR_CERTID] = { .type = BLOBMSG_TYPE_INT64 },
  81         [CERT_PL_ATTR_VALIDFROMTIME] = { .type = BLOBMSG_TYPE_INT64 },
  82         [CERT_PL_ATTR_EXPIRETIME] = { .type = BLOBMSG_TYPE_INT64 },
  83         [CERT_PL_ATTR_PUBKEY] = { .type = BLOBMSG_TYPE_STRING },
  84         [CERT_PL_ATTR_KEY_FINGERPRINT] = { .type = BLOBMSG_TYPE_STRING },
  85 };
  86
  87
  88 static int cert_load(const char *certfile, struct blob_attr *certtb[]) {
  89         FILE *f;
  90         struct blob_buf certbuf;
  91         int ret = 0;
  92         char filebuf[CERT_BUF_LEN];
  93         int len;
  94
  95         blob_buf_init(&certbuf, 0);
  96
  97         f = fopen(certfile, "r");
  98         if (!f)
  99                 return 1;
 100
 101         do {
 102                 len = fread(&filebuf, 1, CERT_BUF_LEN - 1, f);
 103                 blob_put_raw(&certbuf, filebuf, len);
 104         } while(!feof(f) && !ferror(f));
 105
 106         ret = ferror(f);
 107         fclose(f);
 108
 109         if (ret)
 110                 return 1;
 111
 112         return (blob_parse(certbuf.head, certtb, cert_policy, CERT_ATTR_MAX) != 0);
 113 }
 114
 115 static int cert_append(const char *certfile, const char *pubkeyfile, const char *sigfile) {
 116         fprintf(stderr, "not implemented\n");
 117         return 1;
 118 }
 119
 120 static int cert_dump(const char *certfile) {
 121         struct blob_attr *certtb[CERT_ATTR_MAX];
 122
 123         if (cert_load(certfile, certtb)) {
 124                 fprintf(stderr, "cannot parse cert\n");
 125                 return 1;
 126         }
 127
 128         return 0;
 129 }
 130
 131 static int cert_issue(const char *certfile, const char *pubkeyfile, const char *seckeyfile) {
 132         struct blob_buf certbuf;
 133         struct blob_buf payloadbuf;
 134
 135         blob_buf_init(&payloadbuf, 0);
 136 /*      usign_s() */
 137
 138         blob_buf_init(&certbuf, 0);
 139
 140         fprintf(stderr, "not implemented\n");
 141         return 1;
 142 }
 143
 144 static int cert_process_revoker(const char *certfile) {
 145         fprintf(stderr, "not implemented\n");
 146         return 1;
 147 }
 148
 149 static int cert_verify(const char *certfile, const char *pubkeyfile, const char *pubkeydir, const char *msgfile) {
 150         fprintf(stderr, "not implemented\n");
 151         return 1;
 152 }
 153
 154 static int usage(const char *cmd)
 155 {
 156         fprintf(stderr,
 157                 "Usage: %s <command> <options>\n"
 158                 "Commands:\n"
 159                 "  -A:                  append (needs -c and -p and/or -x)\n"
 160                 "  -D:                  dump\n"
 161                 "  -I:                  issue cert and revoker (needs -c and -p and -s)\n"
 162                 "  -R:                  process revoker certificate (needs -c)\n"
 163                 "  -V:                  verify (needs -c and -p|-P)\n"
 164                 "Options:\n"
 165                 "  -c <file>:           certificate file\n"
 166                 "  -m <file>:           message file (verify only)\n"
 167                 "  -p <file>:           public key file\n"
 168                 "  -P <path>:           public key directory (verify only)\n"
 169                 "  -q:                  quiet (do not print verification result, use return code only)\n"
 170                 "  -s <file>:           secret key file (issue only)\n"
 171                 "  -x <file>:           signature file\n"
 172                 "\n",
 173                 cmd);
 174         return 1;
 175 }
 176
 177 int main(int argc, char *argv[]) {
 178         int ch;
 179         const char *msgfile = NULL;
 180         const char *sigfile = NULL;
 181         const char *pubkeyfile = NULL;
 182         const char *pubkeydir = NULL;
 183         const char *certfile = NULL;
 184         const char *seckeyfile = NULL;
 185
 186         quiet = false;
 187         while ((ch = getopt(argc, argv, "ADIRVc:m:p:P:qs:x:")) != -1) {
 188                 switch (ch) {
 189                 case 'A':
 190                         cmd = CMD_APPEND;
 191                         break;
 192                 case 'D':
 193                         cmd = CMD_DUMP;
 194                         break;
 195                 case 'I':
 196                         cmd = CMD_ISSUE;
 197                         break;
 198                 case 'R':
 199                         cmd = CMD_REVOKE;
 200                         break;
 201                 case 'V':
 202                         cmd = CMD_VERIFY;
 203                         break;
 204                 case 'c':
 205                         certfile = optarg;
 206                         break;
 207                 case 'm':
 208                         msgfile = optarg;
 209                         break;
 210                 case 'p':
 211                         pubkeyfile = optarg;
 212                         break;
 213                 case 'P':
 214                         pubkeydir = optarg;
 215                         break;
 216                 case 's':
 217                         seckeyfile = optarg;
 218                         break;
 219                 case 'q':
 220                         quiet = true;
 221                         break;
 222                 case 'x':
 223                         sigfile = optarg;
 224                         break;
 225                 default:
 226                         return usage(argv[0]);
 227                 }
 228         }
 229
 230         switch (cmd) {
 231         case CMD_APPEND:
 232                 if (certfile && (pubkeyfile || sigfile))
 233                         return cert_append(certfile, pubkeyfile, sigfile);
 234                 else
 235                         return usage(argv[0]);
 236         case CMD_DUMP:
 237                 if (certfile)
 238                         return cert_dump(certfile);
 239                 else
 240                         return usage(argv[0]);
 241         case CMD_ISSUE:
 242                 if (certfile && pubkeyfile && seckeyfile)
 243                         return cert_issue(certfile, pubkeyfile, seckeyfile);
 244                 else
 245                         return usage(argv[0]);
 246         case CMD_REVOKE:
 247                 if (certfile)
 248                         return cert_process_revoker(certfile);
 249                 else
 250                         return usage(argv[0]);
 251         case CMD_VERIFY:
 252                 if (certfile && (pubkeyfile || pubkeydir))
 253                         return cert_verify(certfile, pubkeyfile, pubkeydir, msgfile);
 254                 else
 255                         return usage(argv[0]);
 256         case CMD_NONE:
 257                 return usage(argv[0]);
 258         }
 259
 260         /* unreachable */
 261         return usage(argv[0]);
 262 }